On Fri, 21 Dec 2018 at 15:09, Eli Zaretskii <eliz@gnu.org> wrote:

>
> Please describe "the feature" in some more detail.  I might be able to
> save you some tinkering with the sources, if nothing else.
>

The feature I needed was a way to draw arbitrary graphics on top of the
buffer content. In my case, I wanted to draw arrows between different
symbols in the text, representing dataflow.

Regards,
Elias